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What is a stack trace, and how can I use it to debug my application errors?
... multiple "Caused by" sections. For these, you typically want to find the "root cause", which will be one of the lowest "Caused by" sections in the stack trace. In our case, it's:
Caused by: java.lang.NullPointerException <-- root cause
at com.example.myproject.Book.getId(Book.java:22) &...
What is the difference between Class.getResource() and ClassLoader.getResource()?
...ive to the .class file while the latter searches relative to the classpath root.
To debug issues like that, I print the URL:
System.out.println( getClass().getResource(getClass().getSimpleName() + ".class") );
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Build and Version Numbering for Java Projects (ant, cvs, hudson)
...is project is a webapp and I'm including this build-number.txt file in the root folder of the webapp - I don't really care who sees it.
We don't tag source control when this is done because we already have our Hudson job set up to tag it with the build number/timestamp when the build is successful....
Easiest way to copy a single file from host to Vagrant guest?
...tu/trusty64:/usr/share/nginx/html I am trying to copy files into the nginx root directory. It says, The machine with the name 'C' was not found configured for this Vagrant environment. The directory and everything is fine.
– Koushik Das
Sep 23 '16 at 6:08
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iPhone viewWillAppear not firing
...imated to appear or not.)
[myViewController viewWillAppear:NO];
Look at RootViewController.m in the Metronome example.
(I actually found Apple's example projects great. There's a LOT more than HelloWorld ;)
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What's Alternative to Singleton
...dependency injection to avoid singletons
Singletons are Pathological Liars
Root Cause of Singletons
Where have all the Singletons Gone?
The last article explains in detail how to move the creation of new objects into a factory, so you can avoid using singletons. Worth reading for sure.
In shor...
Capturing mobile phone traffic on Wireshark
...
Here are some suggestions:
For Android phones, any network: Root your phone, then install tcpdump on it. This app is a tcpdump wrapper that will install tcpdump and enable you to start captures using a GUI. Tip: You will need to make sure you supply the right interface name for the ca...
How to import existing Git repository into another?
...t pull -s subtree XXX_remote master
Git figures out on its own where the roots are before doing the merge, so you don't need to specify the prefix on subsequent merges.
The downside is that in the merged history the files are unprefixed (not in a subdirectory). As a result git log ZZZ/a will show...
How to print VARCHAR(MAX) using Print Statement?
...ll in combination with the SQL Server Management Studio.
SELECT CAST('<root><![CDATA[' + @MyLongString + ']]></root>' AS XML)
You can click on the returned XML to expand it in the built-in XML viewer.
There is a pretty generous client side limit on the displayed size. Go to To...
How to copy a directory structure but only include certain files (using windows batch files)
...cho.
echo Syntax: %0 [Source_DIR] [Dest_DIR] [FileName]
echo Eg. : %0 D:\Root E:\Root\Lev1\Lev2\Lev3 *.JPG
echo Means : Copy *.JPG from D:\Root to E:\Root\Lev1\Lev2\Lev3
It accepts variable of "Source", "Destination", and "FileName".
It also can only copying specified type of files or selective ...